package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetMealDishMapper setMealDishMapper;

    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Transactional // 开启事务，确保数据一致性，要么全部不执行要么执行成功。
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();

        //插入一条菜品数据
        BeanUtils.copyProperties(dishDTO,dish);
        dish.setStatus(0);
        dishMapper.insert(dish);
        //获取当前菜品的id
        Long dishId = dish.getId();


        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(dishId);
            }
            //插入n条菜品口味数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        long total = page.getTotal();
        List<DishVO> records = page.getResult();
        return new PageResult(total, records);
    }

    /**
     * 删除菜品
     * @param ids
     */
    @Override
    @Transactional
    public void delete(List<Long> ids) {
           //判断当前菜品是否能够删除---是否存在起售中的菜品??
           List<Dish> dishes = dishMapper.queryByIdsAndStatus(ids);
           if(dishes != null && dishes.size() > 0){
               throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
           }
           //判断当前菜品是否能够删除---是否被套餐关联了??
           List<Long> setmeals = setMealDishMapper.querySetmealIdsByDishIds(ids);
           if(setmeals != null && setmeals.size() > 0){
               //当前菜品有被套餐关联，不能删除
               throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
           }
           //删除菜品表中的菜品数据
           dishMapper.delete(ids);
           //删除菜品关联的口味数
           dishFlavorMapper.deleteByDishId(ids);

    }
}
